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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 1,406		$ 6,225	$ 153
Operating expenses
Research and development	3,297	$ 3,056	8,637	10,290
General and administrative	1,785	1,769	6,900	5,930
Impairment of goodwill			7,268
Total operating expenses	5,082	4,825	22,805	16,220
Loss from operations	(3,676)	(4,825)	(16,580)	(16,067)
Interest income	121	8	227	23
Interest expense				(186)
Settlement expense			(200)
Other income/(expense), net		1	(2)	5
Net loss	$ (3,555)	$ (4,816)	$ (16,555)	$ (16,225)
Net loss per share, basic and diluted	$ (0.18)	$ (1.03)	$ (1.07)	$ (4.23)
Weighted average shares of common stock used to compute basic and diluted net loss per share	20,294,560	4,692,723	15,533,983	3,839,385

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